Here's a video on where to farm fel armaments, marks of sargeras, and netherweave cloth.
Back at 70 I farmed here for three days to get my epic mount. Anyone who doesn't have their rep with Sons of Hodir or is trying to get rep achievements will pay good money for the fel armaments and marks of sargeras. I suggest selling the fel armaments in stacks of 8 and the marks of sargeras in stacks of 100.
In case the video does not load, here's the youtube link: